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The potential of agroforestry to reduce atmospheric greenhouse gases in Canada: Insight from pairwise comparisons with traditional agriculture, data gaps and future research 农林业减少加拿大大气温室气体的潜力:与传统农业的两两比较、数据缺口和未来研究的见解
IF 0.6 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2017-07-14 DOI: 10.5558/TFC2017-024
Mark Baah-Acheamfour, Scott X. Chang, E. Bork, C. Carlyle
Canadian agriculture is a source of greenhouse gases (GHG) and agroforestry has the potential to sequester carbon (C), and mitigate agricultural GHG emissions. Agroforestry systems are common features in Canada’s agricultural landscape; however, there are limited empirical data to support implementation of agroforestry practices for GHG mitigation. This shortfall of data may be a contributing factor to the lack of policy that supports the use of agroforestry for GHG mitigation in the Canadian agricultural landscape. We reviewed published studies that compared C stocks in vegetation and soils, and/or GHG emissions in agroforestry systems to traditional agriculture across Canada, with the aims of assessing the benefit of adopting agroforestry for GHG reduction. We then identified data gaps and obstacles that could direct future research. We found that most studies reported increases in vegetation and soil organic C storage in areas with woody species compared to herbaceous crops. Agroforestry systems also r...
加拿大农业是温室气体的来源,农林业有潜力封存碳,减少农业温室气体排放。农林系统是加拿大农业景观的共同特征;然而,支持实施农林业做法以减少温室气体排放的经验数据有限。数据的短缺可能是加拿大农业领域缺乏支持利用农林业缓解温室气体的政策的一个因素。我们回顾了已发表的研究,这些研究将加拿大各地植被和土壤中的碳储量和/或农林系统中的温室气体排放量与传统农业进行了比较,目的是评估采用农林减少温室气体的效益。然后,我们确定了可能指导未来研究的数据差距和障碍。我们发现,大多数研究报告称,与草本作物相比,木本作物地区的植被和土壤有机碳储量有所增加。农林系统也在不断发展。。。
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引用次数: 25
China’s Natural Forest Protection Program: Progress and impacts 中国天然林保护计划的进展和影响
IF 0.6 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2017-07-14 DOI: 10.5558/TFC2017-017
Yang-hua
This is a brief review on the progress and impacts of China’s Natural Forest Protection Program that was initiated in response to massive flooding in 1998 of the major river basins of China. The program was heavily financed by the central government and was a success in terms of three program goals: timber harvest control in the natural forests; increase in the total area of forest protection; and, the successful resettlement of forest workers who were affected by reduced harvests. The ecological, social, and economic impacts of the program are discussed.
本文简要回顾了1998年中国主要流域特大洪涝灾害后启动的天然林保护工程的进展和影响。该项目得到了中央政府的大力资助,在三个目标方面取得了成功:控制天然林的木材采伐;增加森林保护面积;此外,成功地重新安置了受减产影响的森林工人。讨论了该计划的生态、社会和经济影响。
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引用次数: 22
Assessing the adoption and impact of genomics research at the Canadian Forest Service 评估加拿大林业局基因组学研究的采用和影响
IF 0.6 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2017-07-14 DOI: 10.5558/TFC2017-018
Emily S. Hope, Debby C. Barsi, D. McKenney
The outcomes and impacts of government scientific research are difficult to evaluate, yet there is a growing demand for quantification of these impacts. Forest and forestry-related research is no exception. We adapted an impact assessment methodology for the evaluation of eleven ongoing forestry-related genomics projects within the Canadian Forest Service. The assessment made use of two tools, a Desktop Analysis and a more comprehensive Project Review survey. Results of the assessments indicate that much of the research contributes to the fundamental knowledge of Canadian forests, but also produces short-term technological benefits, including enhanced methodologies for the protection of Canadian forests from invasive species. A full report is available at: https://cfs.nrcan.gc.ca/publications?id=38253 (English) and https://cfs.nrcan.gc.ca/publications?id=38254 (French).
政府科学研究的结果和影响难以评估,但对这些影响的量化需求日益增长。森林和与森林有关的研究也不例外。我们采用了一种影响评估方法来评估加拿大林业局内11个正在进行的与林业相关的基因组学项目。评估使用了两种工具,即桌面分析和更全面的项目审查调查。评估结果表明,大部分研究有助于对加拿大森林的基本认识,但也产生短期的技术利益,包括加强保护加拿大森林不受入侵物种侵害的方法。完整的报告可在以下网址查阅:https://cfs.nrcan.gc.ca/publications?id=38253(英文)和https://cfs.nrcan.gc.ca/publications?id=38254(法文)。
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引用次数: 0
The NEBIE plot network: Background and experimental design NEBIE地块网络:背景与实验设计
IF 0.6 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2017-07-14 DOI: 10.5558/TFC2017-015
B. Wayne, ShawMargo, DacostaJennifer, G. NewmasterSteven
The Intensive Management Science Partnership: NEBIE Plot Network is a stand-scale, multi-agency research project designed to compare the ecological effects of a range of silvicultural treatments in northern temperate and boreal forest regions of Ontario. The NEBIE plot network was established in 2001 with randomized complete block experiments installed at eight sites. The NEBIE acronym stands for Natural disturbance, and Extensive, Basic, Intensive, and Elite silviculture. Each NEBIE treatment was replicated at least three times at each site, using large experimental units (2-ha plots). The NEBIE plot network provides researchers with an opportunity to conduct long-term scientific studies at multiple scales and disciplines. The operational-scale treatment plots allow assessment of a variety of forest values in a context directly relevant to informing forest planning and management. In this paper, we document the experimental design and describe the sites and silviculture treatments. Information about samp...
集约管理科学伙伴关系:NEBIE地块网络是一个林分规模的多机构研究项目,旨在比较安大略省北温带和北方森林地区一系列造林处理的生态效果。NEBIE地块网络于2001年建立,在八个地点安装了随机完全块实验。NEBIE的首字母缩写代表自然干扰,以及广泛、基础、密集和精英造林。每个NEBIE处理在每个部位使用大型实验单元(2公顷图)至少复制三次。NEBIE地块网络为研究人员提供了在多个尺度和学科上进行长期科学研究的机会。操作规模处理地块允许在与森林规划和管理直接相关的背景下评估各种森林价值。在本文中,我们记录了实验设计,并描述了场地和造林处理。关于samp的信息。。。
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引用次数: 6
Twenty-five years post-treatment conifer responses to silviculture on a Kalmia-dominated site in eastern Canada 处理后25年,在加拿大东部一个以Kalmia为主的地区,针叶树对造林的反应
IF 0.6 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2017-07-14 DOI: 10.5558/TFC2017-022
N. Thiffault, B. Titus, B. English
Research has demonstrated the potential of soil scarification, fertilization, and herbicide application to improve conifer seedling establishment and early growth. However, tree responses to and interactions among silvicultural treatments vary, making it difficult to predict mid- and long-term impacts of silviculture on stand productivity. We thus evaluated the 25-year effects of scarification and herbicide–fertilization combinations on black spruce (Picea mariana), jack pine (Pinus banksiana) and tamarack (Larix laricina) planted on a Kalmia angustifolia-dominated site. Our results show that the effects of scarification and herbicide–fertilization combinations diverged among species. Black spruce was the most responsive species to scarification for height and diameter at breast height. The combination of herbicide and fertilization treatments still had significantly positive effects on the long-term height and diameter growth of all species. Silvicultural treatments resulted in significant reductions in ...
研究表明,松土、施肥和施用除草剂有助于改善针叶树幼苗的建立和早期生长。然而,树木对造林处理的反应和相互作用各不相同,因此很难预测造林对林分生产力的中长期影响。因此,我们评估了松土和除草剂-施肥组合对黑云杉(Picea mariana)、杰克松(Pinus banksiana)和罗望子(Larix laricina)25年的影响,这些云杉种植在以狭叶Kalmia为主的场地上。我们的研究结果表明,松土和除草剂-施肥组合的效果在物种之间存在差异。黑云杉是对松土高度和胸径最敏感的物种。除草剂和施肥组合处理对所有物种的长期高度和直径生长仍有显著的积极影响。造林处理导致。。。
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引用次数: 5
Glyphosate tolerance of eastern white cedar: Third year results 东部白雪松对草甘膦的耐受性:第三年结果
IF 0.6 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2017-07-14 DOI: 10.5558/TFC2017-025
T. Noland, R. Man, M. Irvine
Little is known about the herbicide tolerance of eastern white cedar (Thuja occidentalis L.). To determine the sensitivity of cedar seedlings to timing and concentration of herbicide applications, glyphosate was applied to 2-year-old seedlings at three concentrations (1.04, 2.07, and 4.14 acid equivalent (ae) kg ha-1) at three times (July 28, August 10 and 31), at a research site in north central Ontario. Seedling survival, growth, and biomass three years after spraying were compared with those of seedlings in manual weeding (competition/weed free via manual weeding) and control (no weeding and therefore always competition/weeds) treatments. Only glyphosate applied at 4.14 ae kg ha-1 significantly reduced, by 27%, third year seedling survival. Pattern of sensitivity of cedar seedling growth to glyphosate was diameter>height. Seedlings treated with 2.07 and 4.14 ae kg ha-1 glyphosate had significantly less root biomass than those in the control plots, whereas only cedar treated with 4.14 ae kg ha-1 glyphos...
对东白雪松(Thuja occidentalis L.)的除草剂耐受性知之甚少。为了确定雪松幼苗对除草剂施用时间和浓度的敏感性,对2岁的幼苗施用三次草甘膦(1.04、2.07和4.14酸当量(ae)kg ha-1)(7月28日、8月10日和31日),在安大略省中北部的一个研究地点。将喷洒后三年的幼苗存活率、生长和生物量与人工除草(通过人工除草消除竞争/杂草)和对照(不除草,因此总是竞争/杂草的)处理中的幼苗进行比较。仅施用4.14 ae kg ha-1的草甘膦,第三年幼苗存活率显著降低27%。雪松幼苗生长对草甘膦的敏感性表现为直径>高度。用2.07和4.14aekgha-1草甘膦处理的杉木幼苗的根系生物量显著低于对照,而只有用4.14aekgha-1草甘膦处理的雪松根系生物量低于对照。。。
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引用次数: 0
Effects of economic globalization and trade on forest transitions: Evidence from 76 developing countries 经济全球化和贸易对森林转型的影响:来自76个发展中国家的证据
IF 0.6 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2017-07-14 DOI: 10.5558/TFC2017-023
Lingchao Li, Jinlong Liu, Baodong Cheng, A. Chhatre, Jiayun Dong, Wenyuan Liang
Current forest recovery efforts in developing countries are different from previous efforts in developed countries, especially since the rise of economic globalization in the 1980s. Therefore, forest transition theory should now consider factors relating to industrialization, urbanization, and globalization. While previous studies have mainly focused on the variable trade of primary sector products, this study applies a more holistic research perspective and discusses, more widely, the links between trade, adjustment of trade structure, FDI, and forest transition. The results suggest that the total export value has a significant negative effect on forest area and volume, while the percentage of non-primary products has a significant positive impact on forest volume and density in the 76 developing countries studied. These results indicate that a country or region may improve the forest resource conditions by upgrading the export structure through the development of export-oriented manufacturing and servic...
发展中国家目前的森林恢复努力与发达国家以往的努力不同,特别是自1980年代经济全球化兴起以来。因此,森林转型理论现在应该考虑与工业化、城市化和全球化有关的因素。以往的研究主要集中在第一部门产品的可变贸易上,而本研究采用了更全面的研究视角,更广泛地讨论了贸易、贸易结构调整、外国直接投资和森林转型之间的联系。结果表明,在所研究的76个发展中国家中,出口总值对森林面积和体积有显著的负面影响,而非初级产品的百分比对森林体积和密度有显著的积极影响。这些结果表明,一个国家或地区可以通过发展出口导向型制造业和服务业来升级出口结构,从而改善森林资源状况。
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引用次数: 13
Impact of climate on juvenile mortality and Armillaria root disease in lodgepole pine 气候对洛奇波尔松幼树死亡率和蜜环菌根病的影响
IF 0.6 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2017-07-14 DOI: 10.5558/TFC2017-021
W. Dempster
Variable and sometimes high levels of mortality in lodgepole pine (Pinus contorta Dougl. ex Loud. var. latifolia Engelm.) planted in western Alberta have raised awareness of the need to forecast and ameliorate risks to reforestation success. Mortality and health of regeneration during the 12 years following harvest were monitored and evaluated in relation to climate, site and silvicultural treatments. Results suggest that physiological stress related to evapotranspiration is the most prevalent cause of overall juvenile mortality and susceptibility to Armillaria root disease in planted pine. Mortality and disease not only increase at higher rates of drying during the growing season, but an opposite effect is also demonstrated whereby they decrease with increasing spring temperatures. Mechanical site preparation aimed at countering mortality and disease of planted stock with improved soil conditions appears to have good potential for ameliorating adverse climatic effects in juvenile stands.
阿尔伯塔省西部种植的lodgepole松(Pinus contorta Dougl.ex Loud.var.latifolia Engelm)的死亡率参差不齐,有时甚至很高,这提高了人们对预测和减轻重新造林成功风险的认识。在收获后的12年里,根据气候、地点和造林处理对死亡率和再生健康状况进行了监测和评估。结果表明,与蒸散相关的生理压力是造成松幼树整体死亡和对蜜环菌根病易感性的最常见原因。在生长季节,死亡率和疾病不仅随着干燥率的升高而增加,而且还表现出相反的影响,即随着春季温度的升高而降低。旨在通过改善土壤条件来对抗种植种群的死亡率和疾病的机械场地准备似乎具有改善幼林不利气候影响的良好潜力。
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引用次数: 5
Allometric modelling of crown width for white spruce by fixed- and mixed-effects models 用固定效应和混合效应模型模拟白云杉树冠宽度的异速生长
IF 0.6 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2017-07-14 DOI: 10.5558/TFC2017-020
YangYuqing, HuangShongming
Crown width is an important predictor for tree growth, crown surface area, forest canopy cover, tree-crown profiles and wildlife habitat indices. This paper developed crown width models for white spruce (Picea glauca (Moench) Voss) in Alberta using allometric fixed and mixed models with varying degrees of model complexity. Diameter at breast height was the most important predictor and was used in the base model. Crown ratio, height-diameter ratio and two competition indices (CIs) were additional predictors added to the base model to form four expanded models. At each level of complexity, a fixed model and a mixed model were fitted. Improved fits were achieved for both model types as model complexity increased, and all mixed models provided much better fits than their fixed model counterparts. Population-averaged (PA) predictions by fixed models, and typical mean (TM), PA and plot-specific (PS) predictions by mixed models were compared on both model fitting and validation data. TM and PA predictions by eac...
冠宽是树木生长、冠表面积、林冠覆盖、树冠廓线和野生动物栖息地指数的重要预测因子。本文采用不同复杂程度的异速固定模型和混合模型建立了加拿大艾伯塔省白云杉(Picea glauca (Moench) Voss)的冠宽模型。乳房高度处的直径是最重要的预测因子,并用于基础模型。在基本模型的基础上增加冠比、高径比和两个竞争指数,形成4个扩展模型。在每个复杂程度上,分别拟合一个固定模型和一个混合模型。随着模型复杂性的增加,两种模型类型的拟合都得到了改善,并且所有混合模型都比固定模型提供了更好的拟合。在模型拟合和验证数据上,比较了固定模型的种群平均(PA)预测与混合模型的典型均值(TM)、种群平均(PA)和特定地块(PS)预测。TM和PA各自预测…
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引用次数: 19
The taxation of privately owned forest land in Canada: A review of the taxation systems in all ten provinces 加拿大私有林地的税收:对所有十个省税收制度的回顾
IF 0.6 4区 农林科学 Q3 Agricultural and Biological Sciences Pub Date : 2017-07-14 DOI: 10.5558/tfc2017-016
RotherhamTony
Canada has 400 million ha of forest land. Only 25 million ha (5%) is in private ownership. This private forest land is generally divided in two categories: 450 000 private woodlots covering about 15 million ha in the settled regions of Canada and about 5 million ha in larger blocks owned by pension funds, investors, and forest products companies. The private woodlots are subject to municipal or provincial property taxes. The provinces use several approaches to determine the level of tax to be paid. In some cases, the tax system is used to provide an incentive to manage the land. The property tax system offers a policy tool to encourage active management of the land and help ensure a healthy, diverse, and productive forest that contributes forest-related ecological goods and services to the community as well as timber to the local economy. It is in the long-term interests of rural communities that land remains in production and that forested land is managed to maintain the forest in a healthy condition and...
加拿大有4亿公顷的林地。只有2500万公顷(5%)属于私人所有。这片私人林地通常分为两类:加拿大定居地区的45万片私人林地,占地约1500万公顷,养老基金、投资者和林产品公司拥有的较大地块占地约500万公顷。私人林地需缴纳市或省财产税。各省采用多种方法来确定应缴纳的税款水平。在某些情况下,税收制度被用来激励管理土地。财产税制度提供了一种政策工具,鼓励积极管理土地,并有助于确保一个健康、多样化和多产的森林,为社区提供与森林相关的生态产品和服务,并为当地经济提供木材。为了农村社区的长期利益,土地仍在生产中,林地得到管理,以保持森林的健康状况和。。。
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引用次数: 0
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